Wagner wrote this for his friend Kietz, and it stands as one of his more rhythmically active piano miniatures. It displays an agility and lightness rarely associated with the composer's large-scale output.
Achieving clarity in the rapid articulation while maintaining the overall lyrical shape is the main hurdle.
Comparable difficulty and character — good candidates for what to learn next.
Albumblatt für Ernst Benedikt Kietz, WWV 64 is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Albumblatt für Ernst Benedikt Kietz, WWV 64 lasts about 2 minutes.
Albumblatt für Ernst Benedikt Kietz, WWV 64 is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Albumblatt für Ernst Benedikt Kietz by Richard Wagner, Albumblatt by Richard Wagner, Albumblatt für Frau Betty Schott, WWV 108 by Richard Wagner — see the full similar-pieces list on this page.